Speed-controlling device.



gif /Q A. WALTON.

SPEED CONTROLLING DEVICE.

APPLICATION FILED MAR.20, |911.`

,Patented June 22', 1915.

/3 zo z/ l WITNEssEs:

' `ATTRNEY UNITED STATES PATENT loEEroE.

' ALBERT WALTON, or'. RosToN, MASSACHUSETTS, AssIGNoR To WEsTINcz-:OUSE

ELECTRIC AND MANUFACTURING COMPANY, vA CORPORATION or PENNSYL- 'VANIA.

T all whom itmaz/ concern Be it known that I, ALBERT WALTON, a

- l citizen of the United States, and a resident of-Boston, in thecounty of Suffolk and State of Massachusetts, have invented a new anduseful Improvement in Speed-Controlling Devices, of which the followingis a specification. l V

My invention relates to adustable stops for automatic speed-controllingdevices, and

it has special reference to electrically op-k erated spinning and.twisting machinery.

The object of my invention is to provide r a device of the aboveindicated class which shall be simple and inexpensive in construc- At1on,`etfect1ve and reliable 1n operation, and

- purpose of speed regulation.

When both stator windings bear the same relation to the common rotorWinding, the potentials induced therein are oflike phase and produce amaximum secondary voltage. However, if one of the-stator windings bedisplaced with respect to the other, the pol'tentials in the rotorwinding lare out of phase, whichresults in a reduction of secondaryvoltage and thereby causes a consequent increase in .slip and areduction in speed.

In the commercial application of this type of induction motor tospinning work, it has been customarv to provide means for automaticallyrota'tlngthe movable stator step l by step from apredetermined initialout-of- 'phase position, to a position in which the two stator windingsoccupy the same induc- SPEE'D-CONTROLLING, DEVICE.

'Specication of Letters Patent. Patented une 22, 1915e Application meaMarch 20, 1911. serial No. 615,497. Y

l tive relation with the rotor winding, thus .efi'ectinga gradualincreasein the speed of rotation'of the spindles as the cop builds up,

In actual service, after each frame of spindles has been wound up, theoperation is discontinued; the sp-indles are' removed and new onesreplaced; the movable stator is turned back toits initial slow speed polsition; and the operation is again repeated.

Past experlence has demonstrated the fact that a proper speed 'ofrotation is one of the requisites to successful ,spinning` as the yarnmust be maintained under a definite tension in order to reduce thenumber of breakages.

It is, therefore, essential that each cycle ot Operation be started at apredetermined speed, and, for this purpose, suitable stops are providedupon the motor frame, in order that the relationjof the twostatorwindings shall always be alike at starting, thereby determiningthe speed of operation.' However, as simllar motors are rarely identicalin electrical performance` and, inasmuch as Weather lconditions and thephysical properties of the yarn itself, determine thebest operatingspeed, it becomes necessary to provide a stop having a' considerableelement of adjustability, in order. that thethe driving motor. The nutmay be adjusted .to any desired position upon the shaft and is preventedfrom turning by means of a screw which engages one of the notches in theperiphery of the. nut and isV screwed into the mot'or frame. v

As the movable stator is turned back, after each cycle of operation,thenut gradual'lytravels'along the shaft until it engages the `motor frameand restricts further movement. It is evident, therefore, that the stopmay be adjusted to fix the initial ,speed of each cycle of operation toany desired value,

in accordance with operating conditions. My invention may best beunderstood by reference to the accompanying drawing, 1n

' invention. Figs. 2 and 3 are, respectively, a

viewpartially in end elevation and partiallyin vertical section, and aview, partially'in side elevation and partially in ver? 'tical section,of a' dynamo-electric machine which embodies my invention. Fig. 4 is adetail face view of the oating nut shown in Fig.' 2. Referring .to thedrawings 1n detail,- a dynamo-electric machine 1 is direct com nected toa drum shaft-2, from which a plu? rality of cops or spindles 3 (only oneof which is shown) are operated in the usual manner by means of suitablebelts 4. Each spindle 3 is rotatablymounted upon a fixed rail 5 andAprojects upwardly through an opening 6 in a ring rail 7 having an eyeor guiding member 8 through which the yarn is threaded, as it is woundupon the spindle. l The`ring rail 7 is supported upon a pluralityof'rods 9 (only one being shown) which are pivotally connected to theouter ends of rocker arms 10. The rocker arms 10 are rigidly Jfastenedto an operating shaft 11 which is turned slowly back and forth,

according tovwell known practice, for the purpose of imparting a. risingand falling vmovement to the ring rail 7. A counterweight 12 isv securedto the operating shaft 11 in order to maintain a'smooth and balancedoperation of the ring rail 7.

The construction of the dynamo-electric machine 1, and its operation forpurposes of speed adjustment, is old and familiar in the art, saidmachine comprising essentially,

' a motor frame 13, two stators 14 and 15 and a single rotor 16. Therotor 16 comprises two en'd core members 17 and a plurality ofconducting'bars 18 secured thereto in inductive relation to the stators14 and 15. The stator 15 is rotatably mounted in the motor frame 13 andmay be moved through a considerable arc by means of a worm wheel segment19 which ,is secured-thereto and a coperating worm 20 which is mountedupon l a shaft 21. The shaft 2l is mounted in integral vprojectingportions 22` and 23 of the motor frame 13, one end of said shaft beingprovided with a ratchet wheel 24. The other end of the shaft 2'1isthreaded and carries a noating nut 25 having a plurality of notches 261n its periphery' to receive a set screw 27 .which is screwed into themotor frame.

A pawl 28 is pivotally secured to a suspended lever 29 which is fastenedto the shaft 2l and is adapted to coperate withv the ratchet wheel ,24in a well known manner. The lower end of lever 29 is pivotally -r1gidconnection to the operating shaft 11.

Arectangular recess 32 is provided in one end of the shaft 21 to receivea portion of a suitable handle (not shown), by means of which themovable stator 15 may be operated by hand if desired. Several holes 33are provided in the lower end of the lever 29 for the purpose ofadjusting the connection of the rod 30 to said lever inorder .to varythe operative relationship of the pawl 28 to the ratchet wheel 24, aswill be readily understood. Y

The operation of the apparatus is as fol lows: Having decided upon theinitial speed of operation of the spindles 3, as determined by thr`existing operating conditions, the position of themovable stator 15 isadjusted with respect to the stator 14 until the desired speed isobtained. The ioating nut`25 is then screwed up into engagement with thei projecting portion 22 of the motor frame and is loc (ed in position bymeans'of the set screw 27 which engages one of the notches 26. Thevspinning process may now be started, and, by reason of the rising andfalling movement of the ring rail 7, the yarn is -wound upon thespindles 3 in successive layers.' It will be observed that, at eachdownward movement of the ring rail 7, the stator- 15 is given a slightrotative movement, throughA the agency of the worm and gear mechanism,the pawl and ratchet device and the connecting members 30 and 31. Thus,

. the two stators 14 and 15.'are gradually4 brought into correspondingphase positions and the speed of operation is therebyV au` tomaticallyincreased as the diameter of the cop increases. After the spindles 3have been fully wound, the operation is discontinued, a suitable handle(not shown) is inserted into the recess 32 and the stator 15 is turnedback to its initial position, as determinedby the engagement of thefloating nut 25 with the projecting portion 22 of the motor frame.`Thus, it is evident that the stator 15 is always broughtback to thesame| position before each cycle of operation is started and, therefore,a definite speed' of operation is obtained foreach cycle. If, for anyreason, it is. desired to alter the initial slow speed position, theioating nut 25l maybe adjusted upon the shaft to secure the desiredresult, as 'Will be readily understood.

- The particular advantage in the adjustable stop resides inthe factthat quick, accurate and simple adjustment may be ef- 'fee-ted',A tolcon'form to changeable Weather conditions, to the particular physicalproperties of the yarn, or to differences in the.

4electrical characteristics 'of the operating motors.

My'invention is, of course, not restricted to use With spinningmachinery alone, but

4 may find various other commercial appli- 4 appended claims.

I claim as my invention:

1. The combination with a rotatable member' and means for effectingautomatic operation thereof at a predetermined varying speed, of anadjustable means for fixing the,

initial speed of operation.

. 2, The combination with a rotatable member, means for operatingthesame, and aue. tomatic means for varying the speed of op- -.eration, ofan adjustable stop for fixing the initial speed of operation.

3. .The combination with a rotatable member, an electric motor foroperating the same, and means dependent upon predetermined conditionsfor automatically varying the speed of operation, of means forrestricting the starting speed to any predetermined value; Y

4t.4 The combination with a rotatable member', an electric motor havinga single rotor member and two relatively movable stator members, andmeans for automatically varyl ing the relationship of said relativelymovdriving electric -motor comprising a rotaeol ' table member and avplurality of relatively movable stator members, of a pawl and ratchetmechanism for intermittently varying the relative position-of saidstator members, and an adjustable means forlimiting the relativemovement of said stator members. Y

7. The combination with a rotatable drum, anoperating induction motorcomprising a plurality .of primary members,

one of which is rotatably movable throughI a wide arc, a secondarymember disposed in inductive relation to saidprimary members,

and mechanical means for v arying the position of said movable primarymember,- of an adjustable means for limiting themovement of said primarymember.

'8. The combination with a rotatable drum, a driving electric motorcomprising a rotatable secondary member, two primary stator members, oneof which may be rotatively moved through a wide arc, a worm wheelsegment secured to the movable l primary member, a worm to engage saidWorm wheel segmenta shaft for said worm having` a screw threadedportion, and means for automatically actuating said shaft, of anuthaving notches in its periphery and adapted to float on the screwthreaded portion of saidl shaft, and a locking pin secured to the motorframe and adapted to engage one of said notches.

9. The combinationwith a rotatable drum, a driving electric motorcomprising a .rotatable secondary member, two primary stator members,one of which may be rotatively moved through a w1de arc, a worm wheelsegment secured to ,the movable primary member, a worm to engage saidworm wheel segmenta shaft for said worm having a screw threaded portion,and means for automatically actuating said shaft, of a traveling memberlocated on the screw threaded portion of said shaft, and means forpreventing said member from rotating. 10. The. combination with a'rotatable d-rum, a driving electric motor comprising a rotatablesecondary member, two primary stator members, one of which may berotatively moved through a wide arc, a worm wheel segment secured to themovable primary member, a worm to engage said worm wheel segment, ashaft for said worm, and means for automatically1 actuating said shaft,of means for limiting the movement of said shaft to a predeterminedamount.

11. The combination with an electric motor comprising a rotatablesecondary member and two relatively movable primary stator members, andgear mechanism operatively connected to the movable primary member, saidmechanism comprising a ro- -tatable shaft, having a screw threadedportion, of a nut adapted to float on said screw threaded portion andstationary means for I 120 engaging said nut.

12. The combination with an electric motor comprising a 'rotatablesecondary member, two primary stator members, one of which may b'erotatively moved through a wide arc, a worm Wheel segment secured to themovable primary member,- a worm to engage said segment, and a shaft forsaid worm having a screw threaded portion, of

tot-he 'motor frame and adapted to engage one of said notches.

13. The combination Witha drum shaft, means for operating said shaft andmeans for gradually and automatically varying the speed of said shaft,of an adjustable means fof limiting aie initial speed of Said Shaft m toa. .predetermined minimum'value..

f I [nA testimony whereof;v I `have hereunto subserlbed my name vthissecond day of E. C. Molise,` -I C. C. PILSBURY.

